Incinerator spark arrester



April 12, 1932. A. E. BAIRD 1,854,160

INCINERATOR SPARK ARRESTER Filed July 26, 1930 Patented Apr. 12, 1932ALBERT E. BAIIRID, or Los AnGELEs, CALIFORNIA i'NcINERAToR SPARKABRESTER Application filed m 26,

' Thisinvention relates to improvements in spark arrcsters for use onincinerators and s1m1lar burners.

V One of the objects of the present invention 5 is to provide a simple,efficient and inex-' pensive incinerator spark arrester construct ed ofa minimum number of parts.

A further object thereof is to provide an incinerator sparkarrester sodesigned, ar-

ranged and constructed that it will reduce the tendency of sparksescaping thru the spark arrester and thus eliminate a grave fire hazard;

' Another obj ec't'of this invention is to pro- 1 vide, in conjunctionwith anincinerator a spark-arresting unit which permits products ofcombustion to escape from the combustion chamber of the incinerator butis eflective to prevent sparks from escaping into the atmosphere; i

A stillfurther object of this invention is to providea spark arresterfor use in burners, furnaces, and incinerators that is composed of aseries of circumferential sections of simi- "lar shape andconstructiontofacilitate assembling the sections when the spark arresteris about to be connected at the upper end of an incinerator. i

A further object of this invention is to provide a spark arrester forincinerators and the like which shall be light, strong, durable andconvenient to install or to remove from an incinerator.

In carrying out the present invention a spark arrester is constructedfrom interchangeable sections, each section having a ribforstrengthening purposes, and being formed with, preferably rectangularair openings sufiiciently' small, numerous and closely conti uous toprevent the possibility of large spar s escaping therefrom or there-Qthru from inside the, combustionchamber of the device that mightotherwise create a fire hazard; 1

A further purpose of this invention is to provide novel looking orsecuring means for the several sections of the spark arrester that areto be secured orjoined together;

With the above and. other objects in view my invention consists in thecombination, ar-

193'0. Serial No. 470,541.

rangementand details of constructiondisclosed in the drawings andspecification, and then more particularlypointed out in the appendedclaims, a

In the drawings, wherein similar referonce characters designate similarparts thruout the respective views,-

.Figure 1 is a frontelevation of myrinvention, f I

Figure 2 is a fragmental sectional eleva tion showing two connectedsections frominside the incinerator, v

Fgure 3 is a top plan view of the invention,

I Figure 4 :is a'fragmental sectional elevation of one section showing'the device as'it appears edgewise,

Figure 5' is a fragmental sectional elevation of" another edge of thesection, shown inFiguret, f i I 1 c Figure 6 is a fragmental detail Viewof the circumferential wall of the spark arrester showing the formationof the openings,

Figure 7 is a fragmental detail sectional view taken thru line 7 7 ofFigures 1 and s,

Figure 8 is a fragmental detail sectional vieiw taken thru line 88 ofFigures 1 and 5, an

Figure 9 is a fragmental sectional elevation of an arrester showing itmounted upon part of an incinerator. a

In the drawings, which are merely illustrative of my invention, 10,broadly desig nates the incinerator spark arrester forming my invention.The device is of tubular design and construction, altho it may have anyother shape, it being a hollow body made preferably of a series ofcircumferentially arranged spark arrester sections, such as the arcuatesections 11, 12,;and 13, three in number. Any number of sections couldbe provided. .Each arcuate section is a separate castingformed upon theend of one end edge, say its upper end, with an integral forwardlyprojecting locking lug 14, being concavo-convex of which its concavesurface is designated 15, as in Figure 8, and is designed to engagearound, so as to overlap the coinciding edge of the mating section. Thislug 1 1 is offsetwith respect to the plane of the edge of'the Y arrestersection upon which it is formed as 10" shown in Figure 3, so that whenthe meeting edge of the mating arrester section makes a butt joint orconnection with this lug 14, the two united sections will be trulyconcen trio in manner of assembly. v

Any of the arrester sections, has, in addition to the lug 14 formed uponone edge, another lug formed at an opposite end of its opposite side.Thus the concavo-convex lug 16 is formed as an integral projection uponthe lower portion of the imperforate mar ginal strip N of each section,and projects beyond the mentioned edge of the section so as to overlapthe meeting edge of the mating arrester section, when the two sectionsare assembled as shown in Figure 3. This lug 16 is larger than the lug1a and its projecting portion is offset so as to be able to engage theinner face of the mating section. The concave surface of this lug 16 isdesignated in Figure 8 at 15, and into it projects, externally of thespark arrester, as shown in Figure 1 an integral boss 20A formed uponits imperforate marginal strip M of the particular section and thus theprojection of the boss 20A into the concavity of the lug 16 causes thislug to register properly with the hole 28 (Figure 5) formed in the boss20A so now a screw bolt 19 may be caused to project thru the hole 17formed in the pr0- jecting end of the lug 16 into hole 28 of the boss,and a nut 20 screwed home to tightly draw the two sections in clampedrelation. By registering lug 16 and boss 20A and clamping these surfacestogether the lug 1 is properly positioned so as to make a buttoverlapping contact with its mating section. Hence with the sectionsproperly interconnected it will clearly be seen that the lug 16 of oneof the meeting edges of one section overlaps the other section, and thelug 14 of the second section overlaps the first section, both lugs beingseen from the inner surface of the completed spark arrester. Theinterlocking arrangement already described is repeated wherever twosections are to be clamped together edgewise.

Itwill be noted that each arrester section is formed perforate so as tohave a honeycombed shape in that it is formed thruout its main arc withsmall ports or holes or openings broadly designated 22. These ports arelarge enough to admit air but too small to permit large sparks generatedin the combustion chamber of the incinerator to jump out therethru andescape into the atmosphere and possibly start a fire when brought intocontact with any surface. Each section is formed upon its lower arcuaterim with a spaced apart series of slots 17, to lighten the arresterunit.

In Figure 9 it will be seen that the spark arrester will embrace theupper end of the pipe B of the incinerator, itsv annular bead 25 comingto rest upon the upper edgeofthis pipe which thus supports the sparkarrester in proper position- The rib 25 also reinforces the arresterwhere it is naturally weak. The arrester could just as effectively bemade in one piece, if desired.

From Figure 6 it will also be seen that the rectangular openings 22 maybe formed by me ans of V-shaped ribs the thin edge of which isdesignated 23, the inclining sides being designated 26, while thethickened portions at the intersections of these ribs are designated 24.This will result in considerably strengthening such rectangular openingsand strength is necessary in order to obtain the very best results.

From the foregoing, it will be seen that the incinerator spark arresteris made in a simple manner. It will be understood that the cap piece Awill be applied, in a plastic condition, directly upon the upstandingarms 21 of the upper edge of the incinerator so that these arms willproperly anchor the upper portion of this device. I do not limit myselfto the exact details of construction of this device but mean to coverall variations falling within the purview of the appended claims. Thecap piece A is a cover which closes the top of the spark arrester.

lVhat I desire to claim and secure by Letters Patent is l. Inv anincinerator, a spark arresting hollow unit connected to the upper endthereof and composed of a series of arcuate sections of reticulatedformation, and means for interconnecting all sections of said hollowunit together rigidly.

2. In an incinerator having an upperneck, a hollow spark-arrestingunit'composed of rigidly interconnected arcuate sections each sectionbeing of honey-comb construction, said sections being seated upon saidincinerator neck and being formed with integral upstanding anchoringmeans and ahead rigidly connected by said anchoring means to saidspark-arresting unit.

3. In an incinerator having an upper neck, a hollow spark-arresting unitcomposed ofa series of circumferentially arranged metal sections, meansfor rigidly interlocking the sections of the spark-arrestingunit, eachsection being of honey-comb formation providing a series of ports, a capsurmounting said unit and integral projections formed upon the upperedges of said sections being anchored into the said cap 4:. Asa newarticle of manufacture, a spark-arresting unit comprising a tubular bodycomposed of a circumferentially spaced apart series of verticalperforated sections, said sections having a butt jointed connection withone another, marginally, integral anchoring projections carried by saidsections at either end, and means for clamping said projectionstogether,

5. As a new article of manufacture a spark-arresting attachment forincinerators composed of a circular series of vertical perforatedsections the coinciding edges of the several sections having anoverlapping bearing and means for releasably clamping said sectionstogether in interlocked relation.

6. As a new article of manufacture a sparkarresting device forincinerators consisting of a series of interchangeable arcuate sectionsdesigned when in interconnected to make a tubular structure, eachsection being perforated, a circular series of contacting lugs formedconjointly upon adjacent edges of the arcuate sections, fastenerspassing thru each set of contacting lugs to rigidly secure themtogether, and another circular series of contacting lugs formed upon theadjacent edges of the arcuate sections which are pressed together withan abutting action as said fas teners are driven home.

7. In a device as described a spark arrester composed of a cylindricalunit having at its lower end an annular series of slots, andbeingaperforated thereabove, and an annular internal rib encircling theinner circumference of the unit immediately above said slots toreinforce the slotted portion and to constitute a seat to support saidspark arrester upon an incinerator.

8. In an incinerator, a tubular member having an internal annular ribseated upon the upper edge of the incinerator and having its lowerannular portion encircling the outer face of the incinerator, a seriesof circumferentially disposed posts extending from the upper edge of thetubular member, and an imperforate cap seated upon the posts, so theposts are imbedded in said cap.

9. As a new article of manufacture a spark arresting chimney comprisingtwo-semi-circular perforated sections whose edges contact, a series oflugs formed upon one sec-i tion upon its inner face engaging theopposite section to make a lap joint therewith, the con i tacting facesof the lugs and overlapped section being respectively convex andconcave. In witness whereof he has hereunder set his hand this day ofJuly 8th, 1930.

' ALBERT E. BAIRD.

